Preheat your oven to 375°F (190°C).
Wash the chicken wings and pat them dry with a paper towel.
Sprinkle salt and pepper onto the wings, then evenly coat each in cornstarch.
Place the coated wings on a greased or parchment-lined baking sheet and bake for 20 minutes, flipping once halfway through cooking time.
Meanwhile, prepare the soy garlic glaze by heating up a small skillet on medium heat and sautéing onion and garlic until fragrant, about 2 minutes.
Add light soy sauce, mirin, brown sugar, garlic powder, ginger powder and cornstarch to the pan and stir until combined.
Reduce heat to low and stir until the sauce thickens about 5 minutes. Set aside.
When the wings are done baking, remove them from the oven and brush each one with soy garlic glaze. Return to the oven for an additional 10 minutes.
Remove from oven and garnish with sesame seeds and/or chives before serving.